copper ore is not concentrated by hydrulic washing
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Aside from cuprite (Cu2O) and tenorite (CuO), most of the other minerals of copper are sulfides and Cu(I) salts. These salts, just like pyrite (FeS) are susceptible to oxidation by oxygen. In addition, the sulfides of minerals are prone to react with water in acid-base reactions to form cuprite or tenorite. However, cuprite can react with Cu2S to form Cu(s). TTherefore, as you can see, the density of the material can change drastically during this process due to unwanted chemical reactions.
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Aside from cuprite (Cu2O) and tenorite (CuO), most of the other minerals of copper are sulfides and Cu(I) salts. These salts, just like pyrite (FeS) are susceptible to oxidation by oxygen. In addition, the sulfides of minerals are prone to react with water in acid-base reactions to form cuprite or tenorite. However, cuprite can react with Cu2S to form Cu(s). TTherefore, as you can see, the density of the material can change drastically during this process due to unwanted chemical reactions.
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